split up pdf
Delete a link Select the Add or Edit link tool (Tools > Edit PDF > Link > Add or Edit)
For more information, see Rotate, move, delete, extract, or renumber PDF pagesUpdate headers, footers, background, or watermarks Add or update headers and footers Acrobat lets you add a header and footer throughout a PDF
Headers and footers can include a date, automatic page numbering, Bates numbers for legal documents, or the title and authorFor more information, see Add headers, footers, and Bates numbering to PDFsAdd, replace, or edit a background You can selectively apply a background to only specific pages or page ranges in one or more PDFs
A PDF supports only one background per page, but the backgrounds can vary from page to pageFor more information, see Add backgrounds to PDFs
Add watermarks A watermark is a text or an image that appears either in front of or behind existing document content, like a stamp
For example, you could apply a “Confidential” watermark to pages with sensitive informationShow Online Storage When Opening Files: Display the cloud storage in the file open dialog box
Show Online Storage When Saving Files: Display the cloud storage while saving the fileOpen PDFs from last session on Acrobat launch: Reopen PDFs from the last session on launching Acrobat
Open Documents As New Tabs In The Same Window (requires relaunch): Groups multiple documents into tabs when openedYou can also snap or pull out tabs as individual windows
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Source:how to edit a pdf